A transmission apparatus that (i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s1(t) by applying a QPSK modulation scheme to a first data sequence, (ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence, (iii) generates a transmission signal z1(t) and a second transmission signal z2(t) by applying a phase hopping process, a precoding process, and a power adjust process to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t), wherein an average transmission power of the 16-QAM modulation signal s2(t) being the same as an average transmission power of the QPSK modulation signal s1(t), and (iv) transmits the transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A transmission apparatus comprising: modulation circuitry configured to (i) generate a Quadrature Phase Shift Keying (QPSK) modulation signal s1(t) by applying a QPSK modulation scheme to a first data sequence, (ii) generate a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence such that an average power of the 16-QAM modulation signal s2(t) is same as an average power of the QPSK modulation signal s1(t), and (iii) generate a first transmission signal z1(t) and a second transmission signal z2(t) by applying a phase hopping process, a precoding process, and a power adjust process indicated in Equation 1 to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t); and transmission circuitry configured to transmit the first transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency, wherein ( z 1 ( t ) z 2 ( t ) ) = ( 1 0 0 y ( t ) ) F ( ve j 0 0 0 ue j 0 ) ( s 1 ( t ) s 2 ( t ) ) ( Equation 1 ) where y(t) indicates an amount of change in phase, F indicates a matrix for the precoding process, v is a positive real number and a coefficient for power changing the QPSK modulation signal s1(t), u is a positive real number larger than v and a coefficient for power changing the 16-QAM modulation signal s2(t), and t indicates a slot.
2. The transmission apparatus according to claim 1 , wherein v and u in Equation 1 are provided such that v 2 :u 2 is equal to 1:2.
3. The transmission apparatus according to claim 1 , wherein the matrix F is expressed in Equation 2, F = 1 α 2 + 1 ( α × e j 0 e j 0 e j 0 α × e j π ) . ( Equation 2 )
4. The transmission apparatus according to claim 3 , wherein α is equal to 1 in Equation 2.
5. A transmission method comprising: generating a Quadrature Phase Shift Keying (QPSK) modulation signal s1(t) by applying a QPSK modulation scheme to a first data sequence; generating a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence such that an average power of the 16-QAM modulation signal s2(t) is same as an average power of the QPSK modulation signal s1(t); generating a first transmission signal z1(t) and a second transmission signal z2(t) by applying a phase hopping process, a precoding process, and a power adjust process indicated in Equation 1 to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t); and transmitting the first transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency, wherein ( z 1 ( t ) z 2 ( t ) ) = ( 1 0 0 y ( t ) ) F ( ve j 0 0 0 ue j 0 ) ( s 1 ( t ) s 2 ( t ) ) ( Equation 1 ) where y(t) indicates an amount of change in phase, F indicates a matrix for the precoding process, v is a positive real number and a coefficient for power changing the QPSK modulation signal s1(t), u is a positive real number larger than v and a coefficient for power changing the 16-QAM modulation signal s2(t), and t indicates a slot.
6. The transmission method according to claim 5 , wherein v and u in Equation 3 are provided such that v 2 :u 2 is equal to 1:2.
7. The transmission method according to claim 5 , wherein the matrix F is expressed in Equation 2, F = 1 α 2 + 1 ( α × e j 0 e j 0 e j 0 α × e j π ) . ( Equation 2 )
8. The transmission method according to claim 7 , wherein α is equal to 1 in Equation 2.
9. A reception apparatus comprising: reception circuitry configured to receive a first transmission signal z1(t) and a second transmission signal z2(t); and demodulation circuitry configured to demodulate the first transmission signal z1(t) and the second transmission signal z2(t) to a first data sequence and a second data sequence, respectively, wherein the first transmission signal z1(t) and the second transmission signal z2(t) are generated and transmitted by: (i) applying a Quadrature Phase Shift Keying (QPSK) modulation scheme to the first data sequence to generate a QPSK modulation signal s1(t), (ii) applying a 16-Quadrature Amplitude Modulation (QAM) modulation scheme to the second data sequence to generate a 16-QAM modulation signal s2(t) such that an average power of the 16-QAM modulation signal s2(t) is the same as an average power of the QPSK modulation signal s1(t), (iii) applying a phase hopping process, a precoding process, and a power adjust process indicated in Equation 1 to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t) to generate the first transmission signal z1(t) and the second transmission signal z2(t), and (iv) transmitting the first transmission signal z1(t) from a first antenna of a transmission apparatus at a first time and a first frequency and the second transmission signal z2(t) from a second antenna of the transmission apparatus at the first time and the first frequency, wherein ( z 1 ( t ) z 2 ( t ) ) = ( 1 0 0 y ( t ) ) F ( ve j 0 0 0 ue j 0 ) ( s 1 ( t ) s 2 ( t ) ) ( Equation 1 ) where y(t) indicates an amount of change in phase, F indicates a matrix for the precoding process, v is a positive real number and a coefficient for power changing the QPSK modulation signal s1(t), u is a positive real number larger than v and a coefficient for power changing the 16-QAM modulation signal s2(t), and t indicates a slot.
10. The reception apparatus according to claim 9 , wherein v and u in Equation 1 are provided such that v 2 :u 2 is equal to 1:2.
11. The reception apparatus according to claim 9 , wherein the matrix F is expressed in Equation 2, F = 1 α 2 + 1 ( α × e j 0 e j 0 e j 0 α × e j π ) . ( Equation 2 )
12. The reception apparatus according to claim 11 , wherein α is equal to 1 in Equation 2.
13. A reception method comprising: receiving a first transmission signal z1(t) and a second transmission signal z2(t); and demodulating the first transmission signal z1(t) and the second transmission signal z2(t) to a first data sequence and a second data sequence, respectively, wherein the first transmission signal z1(t) and the second transmission signal z2(t) are generated and transmitted by: (i) applying a Quadrature Phase Shift Keying (QPSK) modulation scheme to the first data sequence to generate a QPSK modulation signal s1(t), (ii) applying a 16-Quadrature Amplitude Modulation (QAM) modulation scheme to the second data sequence to generate a 16-QAM modulation signal s2(t) such that an average power of the 16-QAM modulation signal s2(t) is the same as an average power of the QPSK modulation signal s1(t), (iii) applying a phase hopping process, a precoding process, and a power adjust process indicated in Equation 1 to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t) to generate the first transmission signal z1(t) and the second transmission signal z2(t), and (iv) transmitting the first transmission signal z1(t) from a first antenna of a transmission apparatus at a first time and a first frequency and the second transmission signal z2(t) from a second antenna of the transmission apparatus at the first time and the first frequency, wherein ( z 1 ( t ) z 2 ( t ) ) = ( 1 0 0 y ( t ) ) F ( ve j 0 0 0 ue j 0 ) ( s 1 ( t ) s 2 ( t ) ) ( Equation 1 ) where y(t) indicates an amount of change in phase, F indicates a matrix for the precoding process, v is a positive real number and a coefficient for power changing the QPSK modulation signal s1(t), u is a positive real number larger than v and a coefficient for power changing the 16-QAM modulation signal s2(t), and t indicates a slot.
14. The reception method according to claim 13 , wherein v and u in Equation 7 are provided such that v 2 :u 2 is equal to 1:2.
15. The reception method according to claim 13 , wherein the matrix F is expressed in Equation 2, F = 1 α 2 + 1 ( α × e j 0 e j 0 e j 0 α × e j π ) . ( Equation 2 )
16. The reception method according to claim 15 , wherein α is equal to 1 in Equation 2.
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April 24, 2019
February 4, 2020
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